Microservices with

Apache Camel & fabric8 on Kubernetes

Claus Ibsen

@davsclaus davsclaus

davsclaus.com

I was here in 2011

Claus Ibsen• Principal Software Engineer

at Red Hat

• Apache Camel8 years working with Camel

• Author of Camel in Action books

@davsclaus davsclaus

davsclaus.com

Agenda

• Quick Apache Camel Demo

• Kubernetes and fabric8

• Java Microservices with Kubernetes

• More Information

Twitter Example

• Twitter search w/ keyword

• Live update web page

Twitter Example

Twitter Example• camel-core

• camel-twitter

• 2 java classes

• 1 html page

• 1 maven pom.xml

Main Class

Camel Route

Camel Route (cont.)

html

pom.xml

Agenda

• Quick Apache Camel Demo

• Kubernetes and fabric8

• Java Microservice with Kubernetes

• More Information

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OS Level Virtualisation

Docker Orchestration

PaaS Platform on top of Kubernetes

Services and Tools forKubernetes and OpenShift

kubernetes

Kubernetes

‣ Open Source orchestration platform for Docker containers

• Rewrite of Google’s internal framework “Borg”‣ Declarative specification of a desired state‣ Self-healing‣ Service discovery‣ Scheduling across hosts‣ Replication

Architecture

Concepts

‣Pods• Collection of one or more Docker containers‣Replication Controller

• Creates and takes care of Pods‣Services

• Proxy for a collection of Pods‣Labels

• Grouping and organization of Objects‣Namespaces

• Virtual clusters backend by same physical cluster

Pod

‣ Collection of Docker containers running on the same host.

‣ Pods have unique IPs‣ Containers in a Pod ….

• …. share the same IP address• …. can reach each other via local ports• …. can share data via volumes‣ Pods can have one or more Labels

Replication Controller

‣ Controls Pods selected by Labels‣ Ensures that a specified number of Pod replicas is

running‣ Holds Pod templates for creating new Pods‣ Autoscaling‣ Rolling Updates

Service

‣ View on a set of Pods with single IP address and port

‣ Pods are selected by Label‣ Services are referenced by

environment variables‣ Service addresses stay stable

• Pods come and go (with different IPs)

fabric8

‣ Tools and Services for value add to Kubernetes and OpenShift

• Management: console, logging, metrics, dashboards, …• Continuous Delivery Workflow• iPaaS: Camel route visualization, API registry, Messaging as

a Service, …• Tools: Kubernetes/OpenShift build integration, Kubernetes

component test support, CDI extensions• Quickstarts: Ready to use examples, also available as

Maven archetypes

Agenda

• Apache Camel Introduction

• Kubernetes and fabric8

• Java Microservices with Kubernetes

• More Information

Hello Service

Hello Service

Hello Service

Hello Service

name=Claus

Hello Claus how are you today?

Implementation

Hello Service

Camel CDI Apache Tomcat

HTTP

Implementation

Camel CDI Apache Tomcat

HTTP

from timer to http to log

from servlet transform

hello service

Apache Tomcat

Camel CDI

CounterBean

Ready to run local

Camel CDI Apache Tomcat

HTTP 8080

from timer to netty to log

from servlet transform

hello service

How to build Docker Image?

Maven Project Docker Image

Docker Maven Plugin

Maven Project Docker Maven Plugin Docker Imagebuild

Docker Maven Plugin in pom.xml

Build Docker Imagemvn clean install docker:build

Local Docker Repository

Apache Tomcat

Camel CDI

Our Demo

Camel CDI Apache Tomcat

HTTP 8080

from timer to http to log

from servlet transform

hello service

Static vs Dynamic Platform

Camel CDI Apache Tomcat

HTTP 8080

from timer to http to log

from servlet transform

hello service

Hardcoded hostname and port

Dynamic Platform

Apache Tomcat

HTTP 8080

Camel CDI

from timer to http to log

from servlet transform

hello service

Kubernetes Service

Kubernetes Service• Network Connection to one or more Pods

• Own fixed IP address and port

Kubernetes Service

HTTP 8080

from timer to http to log

from servlet transform

hello service

kube proxy

Kubernetes Master

enlisted on deployment

changes

pod

node

pod

node

Kubernetes Servicefrom user point of view

service ip:port

from timer to http to log

from servlet transform

hello service

pod pod

Service defined in pom.xml

Apache Tomcat

from servlet transform

hello serviceContainer Port =

Inside

Service Port = Outside

Using Kubernetes Service

Camel CDI

from timer to http to log

We want to use hello service

How do we do that?

Using Kubernetes Service

• Environment Variables

• Hostname

• Port

Camel CDI

from timer to http to log

Service Discovery using DNS is available in newer versions of Kubernetes.

Camel using service

• Use {{service:hello}} Camel CDI

from timer to http to log

Ready to run in Kubernetes

Camel CDI Apache Tomcat

service:hello

from timer to netty to log

from servlet transform

hello service

kube proxy

How to deploy to Kubernetes?

Maven Project

How to deploy to Kubernetes?

Maven Project fabric8 Maven Plugin

apply

Deploy - myweb

Apache Tomcat

from servlet transform

hello service• mvn -Pf8-local-deploy

Deploy - mycdi

• mvn -Pf8-local-deploy Camel CDI

from timer to http to log

fabric8 web console

OpenShift CLI• oc get pods

You can also use CLI from docker

kubernetes

OpenShift CLI• oc get services

OpenShift CLI• oc logs -f <pod name>

OpenShift CLI• oc get routes

Scaling• Change replication controller replicas

Scaling• Service load balancing

Load balancing is random in newer version of

Kubernetes

Agenda

• Quick Apache Camel Demo

• Kubernetes and fabric8

• Java Microservices with Kubernetes

• More Information

Links

• What is Apache Camel • http://java.dzone.com/articles/open-source-

integration-apache • hawtio

• http://hawt.io • fabric8

• http://fabric8.io

@davsclaus davsclaus

davsclaus.com